1 Engineered Wood Products BOISE GLULAM . Beam Product Guide WEBGLPROD. 02/2010. 2 .. Just ask for BOISE GLULAM beams Glued laminated timbers from BOISE Cascade Engineered Wood Products add functional beauty to any residential or commercial project. Just ask for BOISE GLULAM beams. No discussion of engineered wood products is complete without mention of glued laminated timber. Glulams are sometimes forgotten in what has become an increasingly crowded field of newer products. Laminated timbers are often the most cost-effective and easy-to- install alternative for beam applications to residential, commercial and light industrial construction. It is usually easy to determine whether to specify a balanced or unbalanced layup and whether to choose Industrial or Architectural appearance grade beams. The benefit to BOISE GLULAM beams is that they can be manu . factured either with or without camber. Most stock beams are Rough Sawn GLULAM available with either a small amount of camber (3,500' radius) or Just one of our custom beams no camber, depending on market demands.
2 BOISE GLULAM beams are manufactured from Douglas Fir-Larch CUSTOM BEAMS. and carry the AITC trademark. Custom beams are manufactured in STOCK BEAMS typical widths of 31/8" through 121/4", with even greater widths subject For most residential applications, stock beams are the product of to inquire and in depths ranging choice. BOISE GLULAM stock beams are available through our from 6" to over 48". They are used trusted distributors, located strategically throughout the country. when large cross-sections, longer Our beams are manufactured in widths of 31/8", 31/2", 51/8", 51/2", lengths, curved and arched shapes, 63/4", and 83/4", with depths ranging from 6" to 24" and lengths up different appearances, or specific certifications are required. BOISE . to 66 feet, with or without camber. Stock beams are available in GLULAM custom beams are manu . Architectural appearance grade, which is intended for exposed factured on a made-to-order basis. applications but can also be used for concealed beams, headers, Please call to determine availability columns, and rafters.
3 Check with your local distributor for availability. of BOISE GLULAM custom beams. Table of Contents Stock Beams, Custom Beams .. 2 Handling & Storage .. 4. BOISE GLULAM Stock Beam and Column Sizes .. 3 Dimensional Tolerances .. 5. Architectural Appearance Beams .. 3 Preservative Treatment Requirements .. 5. Industrial Appearance Beams .. 3 Fire Resistance .. 5. Columns .. 3 Field Notching & Drilling .. 5. Headers .. 3 BOISE GLULAM Building Code Evaluations .. 5. Balanced and Unbalanced Beam Layups .. 3 BOISE GLULAM Design Values .. 6. Layup Combinations .. 3 BOISE GLULAM Allowable Design Stresses .. 7. Deflection & Camber .. 4 Column Tables & Allowable Stresses .. 7. Adhesives .. 4 AITC, Website .. Back Cover Checking .. 4. BOISE GLULAM Product Guide Feb 2010. BOISE GLULAM Stock Beam and Column Sizes 3.. WR .. WR WR WR WR. WR WR . WR.. Architectural and Industrial Appearance Beams $UFKLWHFWXUDO $SSHDUDQFH %HDPV Header (Framing) Beams ,QGXVWULDO $SSHDUDQFH %HDPV Columns &ROXPQV.
4 ARCHITECTURAL APPEARANCE BEAMS HEADER BEAMS. These beams are the beams of choice in applications BOISE GLULAM headers are commonly used for where members are exposed to view, because they concealed applications such as doors and windows have a smooth, attractive finish. Stock beams are where appearance is not of importance. They come often supplied with this appearance so they may in two common widths, 31/2" and 51/2". Check with be exposed to view in the finished structure. Voids your local distributor for availability. greater than 3/4" are filled, three sides (excluding the top) are planed or sanded, and edges are eased on BALANCED AND UNBALANCED BEAM LAYUPS. the bottom face of the member. The most critical areas of a GLULAM beam are the outside laminations. Thus, the strongest laminations INDUSTRIAL APPEARANCE BEAMS are placed in these areas in either unbalanced or balanced layups. These beams are used in concealed applications or in other places where appearance is not of primary In unbalanced beams, typically known as V4s, the importance, such as such as commercial buildings, bottom lamination is stronger than all the other warehouses, and garages.
5 Voids are not filled, and laminations. This allows for a more efficient use only the two wide faces are planed. of timber resources. It is very important to install unbalanced BOISE GLULAM beams with the top side up. (The word "top" is always printed on the COLUMNS corresponding side.) V4 glulams may be designed GLULAM columns are straight and dimensionally true, and installed in both single and multiple-span making framing an easy task. Because columns are applications, and in relatively short cantilevers. available in long lengths, the members do not have to Balanced GLULAM beams, or V8s, have the same high- be spliced together, as is often necessary with sawn strength laminations on both the top and bottom of the lumber. The columns can be exposed to view as a beam, creating a symmetric layup. A V8 GLULAM can unique architectural feature of the framing system. be designed for multiple-span conditions and canti . levers. V8s can also be used for single spans, but BOISE GLULAM columns have all four edges V4s are most cost-effective for this type of application.
6 Eased to match the widths of the Architectural V8 BOISE GLULAM beams may be special ordered glulams beams and have the same architectural at an additional cost; check with your local distributor appearance. All sides may be exposed to view. for availability. LAYUP COMBINATIONS. Balanced Versus Unbalanced Layup Example No. 2D No. 2 No. 1. No. 2 No. 2. No. 3 No. 3. No. 2 No. 2. No. 1 No. 1. Unbalanced Balanced (V4) (V8). = Tension Lamination BOISE GLULAM Product Guide Feb 2010. 4 Technical Items DEFLECTION AND CAMBER CHECKING. For relatively long span lengths, deflection may Checking occurs naturally in timber when wood control the design of GLULAM beams. Building codes fibers dry. As the outer fibers lose moisture and attempt to shrink, they are restrained by the fiber in limit deflection for floor and roof members with "L/. the inner portion of the beam, which loses moisture over" limits. The "L" is simply the span length at a much slower rate. Rapid drying increases the in inches.
7 It can be divided by a number for difference in moisture content between the inner example, 360 for live load on floors to determine and outer fibers and thus the chances for checking the maximum amount of deflection a member can in the timber member. To minimize the potential have for the corresponding span under full design for checking, BOISE GLULAM is produced from special grades of lumber specifically dried to less loads. Thus, a greater amount of deflection is than 16% moisture content. Contact BOISE Cascade allowed for members with longer spans. EWP Engineering for technical guidance. Camber is a curvature that is built into a GLULAM beam during the manufacturing process to offset a portion of the design load deflection. Beams may be manufactured with a 3,500' radius camber on a special order basis . The following chart displays 3,500' radius camber for the listed span lengths: Span Length [ft]. 12 16 20 24 28 32 36 40 44 48 52 56 60. 3,500' Radius Camber at Midspan [in].
8 Example of Checking Camber is specified mostly to reduce the aesthetic HANDLING & STORAGE. effect of long-span members. Camber can also be Water-resistant wrapping is often specified to protect specified to reduce the amount of deflection for beams from moisture, soiling, and surface scratches example, it may be used to limit water collection on during transit and job-site storage. Because near-flat roofs. exposure to sunlight can discolor beams, opaque wrappings are recommended. Beams can be wrapped individually or by the bundle. In applications where appearance is especially important, individual wrapping should be left intact until installation ADHESIVES to minimize exposure to job-site conditions. BOISE GLULAM beams are manufactured with Beams are commonly loaded and unloaded with exterior-grade or wet-use adhesives that comply with forklifts. For greater stability, the sides of the all recognized national GLULAM standards. The pur beams, rather than the bottoms, should rest on the pose of exterior-grade adhesives is to ensure that forks.
9 Supporting extremely long beams on their sides, however, can cause them to flex excessively, the design values of the beams are not compromised increasing the risk of damage. Use multiple forklifts when the beams are directly exposed to the weather to lift long beam members. during construction. Though wet-use adhesives are A level, well-drained, covered storage site is recom . required when GLULAM beams exceed a moisture mended. Keep beams off the ground, using content of 16% for extended periods of time after lumber blocking, skids, or a rack system. Keep installation, the beams still must be protected from beams level. The wrapping on beams should be exterior exposure. (For applications where moisture left in place to protect them from moisture, soiling, content may exceed 19%, see Preservative Treatment.) sunlight, and scratches. For long-term storage, cut slits in the bottom of the wrapping to allow ventilation (ANSI/AITC Standard American National and draining of any entrapped moisture.)
10 Proper Standard for Structural Glued Laminated Timber) ventilation and drainage will reduce the likelihood of water damage, staining, and the start of decay. BOISE GLULAM Product Guide Feb 2010. Technical Items 5. DIMENSIONAL TOLERANCES FIRE RESISTANCE. The tolerances permitted at the time of manufacture BOISE GLULAM beams, like many other wood per ANSI Standard are as follows: products, have advantageous fire-endurance Width Plus or minus 1/16" of the specified width. properties. Unlike steel that loses a large percentage Depth Plus 1/8" per foot of depth. Minus 3/16", or of its strength when exposed to typical temperatures 1. /16" per foot of depth, whichever is larger. during a fire, wood beams char on the surface. Char . Length Up to 20 feet Plus or minus 1/16" ring forms a self-insulating surface layer when wood Over 20 feet Plus or minus 1/16" per is exposed to flame or relatively high temper atures. 20 feet of length. The wood below this layer retains its struc tural Tolerances do not apply to textured beams see properties during a fire.